Facebook first showed off its 3D photos back in 2018, and shared the technical details behind it a month later. But unless you had one of a handful of phones with dual¹ cameras back then (when they weren't so common), you couldn't make your own. Today an update brings 3D photos to those of us still rocking a single camera.

2018年Facebook首次展示了3D照片，一个月之后又分享了产品的技术细节。但当时除非你有一部双摄像头的手机（那时这种手机还不多），否则你自己拍不出这种效果。现在更新后的技术让我们只有单摄像头手机的人也能拍出3D照片了。

In case you don't remember or haven't seen one lately, the 3D photos work by analyzing² a 2D picture and slicing it into a ton of layers that move separately when you tilt³ the phone or scroll⁴. I'm not a big fan of 3D anything, and I don't even use Facebook, but the simple fact is this feature is pretty cool.

以防你忘了或者最近没见过Facebook的3D照片，我可以告诉你，这种3D照片技术先要分析2D照片并把它切分成很多层，倾斜手机或滚动屏幕时各层可以独立移动。我不是特别热衷3D的东西，我甚至都不用Facebook，但我喜欢这个功能的原因很简单，就是它太棒了。

The problem is it used the dual-camera feature to help the system determine distance, which informed how the picture should be sliced. That meant I, with my beautiful iPhone SE, was out of the running — along with about a billion other people who hadn't bought into the dual-camera thing yet.

问题是以前要使用双摄功能来帮助系统确定距离，这样才能知道如何切分照片。这就意味着我和我美美的iPhone SE做不到，还有约十亿人当时都没有买双摄手机。

But over the last few years the computer vision team over at Facebook has been working on making it possible to do this without dual-camera input⁵. At last they succeeded, and this blog post explains, in terms technical enough that I'm not even going to attempt to summarize them here, just how they did it.

但在过去几年里，Facebook的计算机视觉团队一直在研究如何不用双摄像头就能实现这一功能，最终他们成功了。这篇博文解释了他们是如何做到的，技术层面的问题我就不打算在这里总结了。

The advances mean that many — though not all — relatively⁶ modern single-camera phones should be able to use the feature. Google's Pixel series is now supported, and single-camera iPhones from the 7 forward. The huge diversity of Android devices makes it hard to say which will and won't be supported — it depends on a few things not usually listed on the spec sheet — but you'll be able to tell once your Facebook app updates and you take a picture.

取得的进步意味着虽然并非所有手机，但是目前很多相对高级的单摄像头手机应该都能使用这一功能了。谷歌Pixel系列现在支持这一功能，还有单摄像头的iPhone 7及配置更高的手机都可以。安卓手机种类太多，很难说哪些安卓手机支持这一功能，这取决于一些通常没有在产品规格中显示的数据。但你只要更新一下手机中的Facebook应用，拍个照片就知道了。